Study On The Synthesis And Performance Of New Solid Luminescent Materials With Adjustable Luminescence Behavior

Organic fluorescent compounds are widely used in solar cells,field-effect transistor,fluorescent probe,organic electroluminescence,light-harvesting systems,etc.due to their high luminous efficiency,good sensitivity,specificity and other special properties.However,the organic fluorescent compounds always suffer severely concentration quenching effect while in solid or aggregated form.Aggregation-induced emission(AIE)which firstly discovered by Professor Tang,has provided a new and effective approach for the development of new organic fluorescent compound with efficient solid state emission.While new AIE system is continue to emerge,there still exists a notable void in AIEgens toolkits:AIEgens with tunable emission color.This thesis will focus on developing a new class of compounds having the AIE effect,and using chemical modification or external stimulation to adjust solid state emission.Its mains contents summarized as follow:The first part,we use chemical modification to design and synthesize a series of compounds(la-1d,2a-2g)which have tunable emission color in solid-state.And then we study their photophysical properties in the solid state and in liquid form.Secondly,we found that the compound 2b,2c and 2d have mechanochromic luminescence properties:their emission wavelength moved to the red by grinding but go back to the original wavelength after fuming with dichloromethane,powder X-ray(P-XRD)also can validate their mechanochromic properties.Compound 2d with different crystal forms can be obtained by growing single crystals in different solvents,and heating can be used to convert to crystalline emission.